October weather forecast
Surabaya, Indonesia

October in Surabaya introduces a slow yet perceptible transition towards the wet season as rainfall gradually increases on the city's vista. The weather remains on the warmer side, but the rising sea temperatures and cloud cover indicate a change in the season. A notable feature of October's weather is the consistent wind speeds that influence the temperatures subtly. Sunshine hours start to reduce, signaling shorter days. As October progresses, the dawn of the rain season is seen through the increasing number and intensity of rainy days.

Temperature

October brings the highest temperatures, with an average high of 32.9°C (91.2°F) and an average low of 26.4°C (79.5°F).

Heat index

Throughout October, the heat index is evaluated at an extremely hot 40°C (104°F). Ensure heightened precautions, risk of heat cramps and heat exhaustion is significant. Sustained activity could provoke heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. The heat index might be elevated by 15 Fahrenheit (8 Celsius) degrees due to direct sun exposure.
Note: The heat index, also known as 'feels like' or 'apparent temperature', unifies temperature and humidity readings to offer a comprehensive feel of warmth. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. With the sun shining directly, it's crucial to understand that it can increase the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Kids often lack the knowledge about the necessity to take breaks and consume liquids. Thirst, as a late symptom of dehydration, necessitates the maintenance of hydration, particularly during enduring physical activities.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. When there is abundant moisture in the air, the body's cooling through the evaporation process becomes less effective, leading to the sensation of overheating. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

With an average relative humidity of 63%, October is the least humid month in Surabaya.

Rainfall

In Surabaya, in October, it is raining for 7.6 days, with typically 14mm (0.55") of accumulated precipitation. In Surabaya, during the entire year, the rain falls for 187.8 days and collects up to 839mm (33.03") of precipitation.

Sea temperature

In October, the average sea temperature in Surabaya, Indonesia, is 28.9°C (84°F).
Note: Surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as excellent and extremely agreeable for enduring enjoyment in water activities.

Daylight

In Surabaya, the average length of the day in October is 12h and 16min.
On the first day of October in Surabaya, sunrise is at 05:13 and sunset at 17:23. On the last day of the month, sunrise is at 05:01 and sunset at 17:23 WIB.

Sunshine

August through October, with an average of 9.9h of sunshine, are months with the most sunshine.

UV index

The months with the highest UV index in Surabaya are January through December, with an average maximum UV index of 7. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the average person.
Note: The daily high UV index of 7 during October translates into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Be wary! Reflections from sand and water make UV radiation more intense.